Update rtCamp/action-slack-notify digest to 2ca439b

Author: renovate[bot]

.github/workflows/notify-on-push.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Slack Notification
-        uses: rtCamp/action-slack-notify@12e36fc18b0689399306c2e0b3e0f2978b7f1ee7
+        uses: rtCamp/action-slack-notify@2ca439b4dfa143e2773d22256c14c53bec1741ab
         env:
           SLACK_COLOR: '#DE512A'
           SLACK_ICON: https://github.com/nodejs.png?size=48
@@ -56,7 +56,7 @@ jobs:
           GH_TOKEN: ${{ github.token }}
       - name: Slack Notification
         if: ${{ env.INVALID_COMMIT_MESSAGE }}
-        uses: rtCamp/action-slack-notify@12e36fc18b0689399306c2e0b3e0f2978b7f1ee7
+        uses: rtCamp/action-slack-notify@2ca439b4dfa143e2773d22256c14c53bec1741ab
         env:
           SLACK_COLOR: '#DE512A'
           SLACK_ICON: https://github.com/nodejs.png?size=48